Fig. 2

Detection timeline of residents and staff with positive PCR results for SARS-CoV-2. The number of residents and staff in each unit represents the data as of April 1, 2020. The PCR + C and PCR + S indicate PCR positivity in comprehensive (facility/unit-wide) and separate PCR testing, respectively. Staff no. 1 in Unit 1 was identified as PCR-positive in another hospital on March 31, 2020. SARS-CoV-2, severe acute respiratory syndrome coronavirus 2